Beta-blockers or Placebo for Primary Prophylaxis (BOPPP) of oesophageal varices: study protocol for a randomised controlled trial. - Patel VC; McPhail MJ; Uddin R; Jafari H; Lawrence V; Le Boutillier C; Shearer J; Yaziji N; Cape A; Ahmed H; Ward C; Walsh P; et al. (Trials, 2024)